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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b739b4e1d529b3b035d4be9ef51dd3ba3e758fce6a90fed12a3d9ce9f48cc432' 
  AND token = 'I1XEb0nKbWzOut8164kJi7jFmlxfOh5Mth4IYFqpdDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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