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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e396e2b3c3bbd6dcae7945ab8c7a6009a0359a45b3535fd2d344e21dda130b11' 
  AND token = '4xBBD+/1S4bt9ugsuPwrGwTw7zi/tc5LvEdwqYUgkYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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