SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3cc25831d8a160769eb382a25d285ab6ff58c7c189246ad9561552f324f0b47' 
  AND token = 'Y6jF+2GHLOyszUKUWhEagSXCBeIDiF7u0NMgxVy0/Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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