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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2197d409f7fa9db00646fc81a8bfd2ca7470f4fc640e644153b42860dd03ca3b' 
  AND token = 'XHAouyJNaRWqfH4muByUHbpjyAO9aPPJpkY8/3cs830=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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