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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c285bb86f128ec076bf23b24257f899297b31572d4122fbf77fb14570625a12' 
  AND token = 'd4lF/jXwoxxPqtnABC8ufa6H1Iu4E1JGqz9qPsjtjN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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