Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e8bbf700f9009912bc5bb13de75d6d2d5238e7f34fd0dec880d22955a0fcaa' 
  AND token = '73XrSy89svKARUcSMih4e+poXzy9xSK0yBz7h4PMEn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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