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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b548550827bbc37ce06e776db43dbd7d706c208ada0a1f52b39c0002d760d5' 
  AND token = 'FHEmxfOn4x+Js05XQ1gG7PZ9u5B3OH3AgSg5O+GbiY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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