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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b40d563f899d916b60662a06599e0c72cfc18c697ff0ea7fa121e8b8c2b39ad' 
  AND token = 'LwsTqLbIPTyyjaF9XURFtR9PqSioP2wD4XptT4Kn9gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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