SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c44174be1cca0ce2194ba595427a81ddf7930aa13f8a97f79362711db8e52c0' 
  AND token = 'W2/4kyszKpgoiHqlUOhSw8MHMlJ061B9XbWhTYR/+54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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