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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6005247c779e9458569585b48b18e7af53f917b15bfe85cd6943015317545a64' 
  AND token = 'B6fvvs5DpgtvaAJ3vFevagnY+1Lrt03rI1ZENVNL1xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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