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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0379f8294e9645d667f366af5c9a251df3c33aac78aa3aa73e4bae5cb63f703e' 
  AND token = '/9dwUE9JiWflHSitW8begNERdcJzbqAKtnJSPRsy7s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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