SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9b8703e5511f57f4cf982de63b2a0364ca477f8b92259a5b68825463ef5762' 
  AND token = 'h56pbR99jYztoW8QA19vsKNQriqoq8ZescjJL2rRwBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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