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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8642db91a292b326b091bd939d2bea65e4546407a63f93abbf45915119e7618' 
  AND token = '0kJr4kl7OzE9y7mz8sX4+6Qa3+ojHuTqEtBWOZCINUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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