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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549b9f52a74a27a6bb547f74b89557cc8a44573d5f252445195caca87ca1c861' 
  AND token = 'J3lsTrd+I7SBeCztCmQVDL5Qtzzb6o3mYkQZTsGtLCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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