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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0288957f137590afe2d2f884b8a540a2d3dc189864ac7050e6f65a027579bc' 
  AND token = 'uB6MXHl1NRwwlFjacTSVvvneaDlYF2yPD6yCheTeHIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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