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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4b44d4e232359cb1b99efd9c224cc2e9f5f3e12bfaa66b960b96c96befadb6' 
  AND token = '0BZsdaefYFv2X83ijEnShF4ynP0VOoB3ugUXl9Osd+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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