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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712b9038aaf7529f52b14b3df07a1ae16fbef7aed090b720b44edb3c472256c4' 
  AND token = 'TXLj2G33if5sEVTa3W/nfFJ5pA/t4TSOSSKjByXlihk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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