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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504fbc49a53b3c4929cb3e04e2df520182e0a51dedfd5e2c4f2985f228fd4097' 
  AND token = '9SZ/LWixT59EaGw19cbK5+Rbu5qNoan7Ba0kYQPyKJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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