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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9341d62731bae74e6fab1b55c15103805623473db79ec304ba79129b070d8512' 
  AND token = 'hfLw2M+beUjmuQO4i73CMmtqYzQeYty0fMsET3jE8l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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