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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0186d4a742b6ddf4b81b4dbff81c7063d94ca20119bb5eed362fb00ec8d62fb6' 
  AND token = 'rx8Np7hSKeGOhVLxyearXE0TklR9zuesEm4JEdMvOGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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