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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb3a017de5e47966e1aac966a3a98102248cb0e97b97cb851c0fd1e66349a23' 
  AND token = '0zXUDNN8zZQi1W53bbfhVnXWkVxluzlp6GDyo+NdHmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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