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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef9dca37cda29796a2053f1602934906918b1b5abeb30bafda3c2db2207fedb' 
  AND token = 'S8uoCal1I1gNE4RsFdjiiV5YFxrglsknkXUS0JGdSi8=' 
  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"
    }
  }
}