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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4087ab587447764a4b545838bfb7f46b65a284aed3737ab8fa5cd398a4f08809' 
  AND token = 'ZcW4+t13pYHgCCx8QyRnvRB4W4xkF9PIvn58hE/ZX4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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