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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e556367b94a29b56898adebaf5e7a6544dbd7e3d2bac1dbcde4ac3e24d8b3e' 
  AND token = 'XMt7kylUTRDhq7Gs4NrMXBeHgz1Qc/6tDrPiyfSn5js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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