SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8dd7e624ad8366f3d3d631518715f6e44a46e03f1f38119955a30c2af3660d' 
  AND token = 'SuVnRZkgMtrDhG3EKSNsuFHz4jDhhL7qB+1XGaB1GJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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