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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0925115ac822b368443021ac7d84e557b7da10a09cbf401ffb2c501ac99d452c' 
  AND token = 'WDLDivYKtQausK9d/JN/Il5ajxVXN8DQs7Fv5GAoZLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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