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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a54b9a5f1638c43d5a866ed3acc9330c636ad491f28667f7ef23aaa49e1b15' 
  AND token = 'HsK9nKfRSSnub0E0l4q5hx/QNm5mEiS9Mt9eTljS8Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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