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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d77a27ac273dc6294e00ceea85b834894733545e20b6e3c76ce8a97a63005f' 
  AND token = 'fcUbxA+IoLstJFUVOeU6cw4hWp7pBph4eHxeI5zWEvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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