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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a9dd09026c39c438606893935d634be6cda129ada26c251e0625943c5b2038' 
  AND token = '2DFNoLngb8aBlWInnch/q3RN4Rp2KI2JvnIKT4uXLSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}