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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6177e2f77bbda024c74db24d264dff89d3d459f102ca64394d176d424059b40' 
  AND token = 'uVCQQf9Rq3aYfgCZPSotbBll3IKLSO7MRStT7yxszpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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