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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2314c10885d7c3b3621370d453b35d0c60288f746521dfee13cf67b5f6f08162' 
  AND token = '9ZDjoAa+aPruERps95wbEn+nf9QU2Lf8d5918OCv7Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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