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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a69244ea4696a405991fa2b8646e7adaf05383c9a93d776acb3a064b793db71' 
  AND token = 'aPlVu10msoEdn9GFGU/M3jCYIva9pLelOMoKRkpLwzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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