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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44c5ad2d63455646a67de06f6935b5c8d1b4e5123b7df84036956dfd855d5b8' 
  AND token = '0/yFcxB1cBq7i6csWxan+N7H5G2zNJVLs17coeUSWqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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