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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf72ed490ca01a2b53f0ff3d8a2feb588b119d908eb8fc4bcb566ad743882828' 
  AND token = 'B2arLJ4iXVnn0ooPrQsXtwvu7i36/A3ASBq01H/IwMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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