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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1116a623e57d7c09ce3e6ac3baf97b93e4596874b9ed8a85bf43ae38b9a4a28f' 
  AND token = 'L4x4IB7BjpV5y/nTRxQ4QIm9bwJq/Aw31lIZ39yev3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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