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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f00e7433d12fcded71aa2797e22ad5b3dbd8718ac480c51a03b908eac96ed6' 
  AND token = 'LubmYtEkInhupyKwC7wxoXWINz66qkd8FEauD3tX6qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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