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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c9d6d9ea7f93b4c4dffe890031af699ee8c23037a78ccc5a6bf7d76f1fa85b' 
  AND token = 'Byf8KFo3L4SP8YqktlMFOcONJ7gqSU5Dp1z9NW3iHdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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