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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2526d205dd3bcfdfcc828ee31f4aaaf1bd28c1a90e53074c64aaf2b202e04d9' 
  AND token = 'i4JlRPq7fOh/fHGPIRX5kmqGNBkOpCx0Uz+KOIxi3F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}