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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1426d9f67b2376a2cdcff9b1c567d312fd341a3aa8a0c539d8a4dd7762c0fbfd' 
  AND token = 'PvQYnB8Ljv1Wk69NOHqXvS87YAPBzYFhoPY39Spp73w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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