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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b215753ed89581bb81d24101715ba3d82849746489cf773ae063b591cdbd3f' 
  AND token = 'JtpYiXWhqAWg6aFVU0OFnICgLIC1XMGYqy79IdUnnxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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