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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb1440ab23e1501fdabd1fe4568622ba155cdd6a1dcb66d8f61ac28a13e3079' 
  AND token = '2mOqunoqIiEPvPzzA3JDVdLiJsE8xahnEE1tpDfI8Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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