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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ca670838f8198897ef11cfae7499a6bb23ab1af3c09b83fde284ddf42368e7' 
  AND token = 'E0xPveQw1IOWcQFeakJsMqus7uHupcehj+UdYoE1Pus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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