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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc055f720a5242f65905c12859c2791146f9a5f6f7817902d1af5fd9817ddef5' 
  AND token = 'BHXtcM7qrPE6PQ4Q40z+dvRt8TvuUMSgpZlIuz8DrBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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