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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87fd23f618f24eb5e21a71cb79a452976e8c371319a46d2830a174e0166dc12' 
  AND token = 'lopUJ5nX/jxMBhXaQgO7Izr65r4jJjHJntak5rCJQaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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