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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b17a044138aa58e2a68599ff0ce2a3d3d90691e3b8a92ae29e7ed7c60cb2871' 
  AND token = 'on+hVx6T5PWQU1ptEumn/FonTu5Jdnj5274U2snshfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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