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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0907ea85f273d7d5aae354ace894d7610d500b330de9d378a6b504a1161afe72' 
  AND token = 'kNLpoAIzExRUXTDGO0RqkVGzD9b6byaJNQ4m4Zzj3kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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