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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd66de71907d7c2272e34744155fa092ba3d956459235c7e1c4a5373034043b7' 
  AND token = '9Yls2Orh1SsY553O6s8pWCQJLtOLgrYL4cjjZCE3TsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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