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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a512d467bd6f1af92cde181a8e41a7c1b0cf2efccaa4c1f7a5ed5ecc686cb2d' 
  AND token = 'BOpDc3VxrZkbIPaQNuHYwKVkuoxcRBQFgg4mNccIvxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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