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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31e89de6ffef8099b98b4c45d333b27118faa07a978ce0e1e4302a96d0fff44' 
  AND token = 'IMSJuD2Cup+o6fKvlNb74lSfFJEuZB0uN7Z+Mxa/O7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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