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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a52f42c540c37b717ee0054fc45a8cbe43aff38d1f3ccf40efec34a672b93e' 
  AND token = 'BBjQVv9oMzloeO50AYn6cS1LU3zKOn2WNwSTgPGI+AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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