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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8190a0749babf7a21715c0d42c7277f9f71326e53c7a720ed65d224187b8e5c5' 
  AND token = 'n5EpOXBiBqf4pYsHkk8BaP9DyfalN9TwY9cjk+Pbwps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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