Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83db237f88c21701f7b750fd79a980a7574848afe219b5667d7de2d7da8f9f7' 
  AND token = 'zRbGO6bU08kaWHNVeayFTMN848ERCHLs5iKRCrqEGVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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