SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82385125c9c26a7c99bf81c548fd5c2daa2eb29b32699f9b5365e82c45ba420a' 
  AND token = 'bgv3IOJAoTjdWzZbuzKPdY6XJxsLvdjZOU/2PpBsnGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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