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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c8799ad4f310433579f543eb3ff873abb4856e01128ab6c5500e127e007abb' 
  AND token = 'UV+RvLW+I4Kp8RJbKr0awnAwytIA2/muXevlPUksV5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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