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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbc9d5c0deff876db0907304ac84598711d7b6823db24c289d6e5218e416331' 
  AND token = 'wOfmdeqoy4lDDfgTdOOdtJPloA9Wom8BR5uo4gs0p/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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