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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619b78a32118e025140294fe4d2b3da38a6a7b88f59a6298d034c053f2821bac' 
  AND token = 'UdNgzkeAqGKC8kXaA8jdWen7N7bL8smQkv9FKAh17QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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