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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6497576a8eacb5310113c50d869b779256178020e905f3a3188e6e1d45e60098' 
  AND token = 'eInSXUeqtbcLtmDoXeagSRqzBsNJgyAUONEZT165xbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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