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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77a58f3fb4bd39f7cecafd58e5dcd57a1bdba1929246179ded54ae097137add' 
  AND token = 'UoGom7uSwoDH+bFu4BT9753YsjzfxP39uCu8ab47cxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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