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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed717d21d6eac1bed8b70bc9b34245e5e8bf05a815c5c2515a49054d82d38b1' 
  AND token = 'dN235EBotjuxA8hvXK8EbqaX94zLvxQxPoQV7k0s46I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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