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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c1bba3883fc7a893109f570c1cf5b4b11e52413c2b840ea21a289bf49a9318' 
  AND token = 'KHxVgOn4boK8XTlTljZ46IAe72vb4C4SofVfemBKmN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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