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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504ef294a9358cda13322bd49e7010cc54fa1476cad3a4da57f372e42f91ffd7' 
  AND token = 'Oixr5ab/YV09NBw5OMab5T7wLCaHU6/Eg7yUO0icNUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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