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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc334ef90a9b3be2104607c923571a837ec754eb8ac12328de38392cf14d7fa3' 
  AND token = 'vrMp40R1T2rWiDp2NOUuxTg1dxR3Mq9zAJYuwzj4JfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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