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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a572a1c10bff520da72cb5ca41bb23ed352d896d0c0ce9f54d1f8209c57f6c5a' 
  AND token = 'rwzHvTTUoFYv3bYsYbmrTsiwgaTs9Sv/0GO06F2bXoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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