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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e23cf4270bb4c2874652d8377cbb6fc1d62acf1c9f1ad524b1de180306f55ee' 
  AND token = 'a1Gt4GUe127h2nh4MDdq2TQ1ENUre3HncE71mkwzAhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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