SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24684761325ec620cfe3f95a65e9d2a21da684dab2e7d4dfbacfa21b32298fab' 
  AND token = 'CWSEqk/uhqXKEuty+N8ZKjqZvdeYHV6bg7RknGhHElk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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