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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fba68234c582d3a33092712ea5c394e1a7811cc6cf77ad10a9f38f41d2095f4' 
  AND token = 'ljmH/o5jnOUpXSBnMc8BuIv60E0GT3AWj+EAAPkD6H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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