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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824e62373ffc2ce9dc940a18a9731e2c0666ce0d02313a86dec7b6cb4b5d7aef' 
  AND token = '14KsBNZfwtSCXDun9vwe/uCg67hwca2vud9cLElBb1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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