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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316687372744863cfe6f254e666a11f0ff2d32495f0cc043070a17d3f307eda0' 
  AND token = 'Km3sSwFSIp0uLKNXD9Ma68L9aygG+g2NdnEkt3BILpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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