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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15444e5f1fa085eefd8a3415bbb2508ca35b28f8e02153de4149427774139a86' 
  AND token = 'eDYzvNgrD4k18oW7Wu0HnOc7JTrdfgjxq4mhj6Y4w4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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