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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562b6a518a305ec2cd11274cc577c773ebf01ad14806c731d2464b3040b992d2' 
  AND token = 'MMasb4O6BJ6PHTssCT8XRtvLLbIsfqCIIbF0zru8ing=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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